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Moving from Mac OS Extended to APFS on boot disk prior to Mac OS update

how to erase High Sierra on Mac OS Extended (Journaled) Boot disk on Mac Mini 2012 then reformat to APFS in order to install Catalina combo update?

Mac mini, macOS 10.13

Posted on Sep 20, 2022 6:59 AM

Reply
5 replies

Sep 20, 2022 1:36 PM in response to tomi_r

What OS are you on now?


Sounds like you may have gotten a Combo Updater that requires an earlier 10.15.x version, instead of the whole Installer?


MacOS Catalina 10.15.7 - Technical Specifications


General Requirements

OS X 10.9 or later

4GB of memory

12.5GB of available storage (OS X El Capitan 10.11.5 or later)*

Some features require an Apple ID; terms apply.

Some features require a compatible internet service provider; fees may apply.

Mac Hardware Requirements

For details about your Mac model, click the Apple icon at the top left of your screen and choose About This Mac. These Mac models are compatible with macOS Catalina:

MacBook (Early 2015 or newer)

MacBook Air (Mid 2012 or newer)

MacBook Pro (Mid 2012 or newer)

Mac mini (Late 2012 or newer)

iMac (Late 2012 or newer)

iMac Pro (2017)

Mac Pro (Late 2013 or newer)

How to download macOS - Apple Support


https://apps.apple.com/gb/app/macos-catalina/id1466841314?ls=1&mt=12


How to upgrade to macOS Catalina – Apple Support


And caution on 10.15 or higher, to see which Apps will no longer work in 10.15 get Go64...


https://www.stclairsoft.com/Go64/


Sep 20, 2022 1:25 PM in response to BDAqua

Hi, i would happily allow installer except i get “macOS 10.15.6 Update can't be installed on this disk. This volume does not meet the requirements for this update."


forum indicates that i should convert from Macos extended to AFPS, but it is greyed out in Disk Utility, presumably because it is the boot disk.


in any case, I use Time Machine as my current back up strategy. Is this likely insufficient?

Sep 20, 2022 1:49 PM in response to BDAqua

Hello,

This is me.


Model Name: Mac mini (Late 2012)

Model Identifier: Macmini6,2

Processor Name: Intel Core i7

Processor Speed: 2.3 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 6 MB

Memory: 16 GB


System Version: macOS 10.13.6 (17G14042)

Kernel Version: Darwin 17.7.0

Boot Volume: Macintosh HD

Boot Mode: Normal


I'll take a good look at your links. Many thanks.

Moving from Mac OS Extended to APFS on boot disk prior to Mac OS update

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